html,
body,
#app {
  margin: 0;
  padding: 0px;
  height: 100%;
}

.header {
  height: 50px;
  background-color: #545c64;
  line-height: 50px;
  text-align: center;
  font-size: 24px;
  color: #fff;
}

.footer {
  height: 40px;
  line-height: 40px;
  background-color: #888;
  position: absolute;
  bottom: 0;
  width: 100%;
  text-align: center;
  color: #fff;
}

.main {
  display: flex;
  position: absolute;
  top: 50px;
  bottom: 40px;
  width: 100%;
}

.content {
  flex: 1;
  text-align: center;
  height: 100%;
}

.left {
  flex: 0 0 20%;
  background-color: #545c64;
}

.left a {
  color: white;
  text-decoration: none;
}

.right {
  margin: 5px;
}

.btns {
  width: 100%;
  height: 35px;
  line-height: 35px;
  background-color: #f5f5f5;
  text-align: left;
  padding-left: 10px;
  box-sizing: border-box;
}

button {
  height: 30px;
  background-color: #ecf5ff;
  border: 1px solid lightskyblue;
  font-size: 12px;
  padding: 0 20px;
}

.main-content {
  margin-top: 10px;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

ul li {
  height: 45px;
  line-height: 45px;
  background-color: #a0a0a0;
  color: #fff;
  cursor: pointer;
  border-bottom: 1px solid #fff;
}

table {
  width: 100%;
  border-collapse: collapse;
}

td,
th {
  border: 1px solid #eee;
  line-height: 35px;
  font-size: 12px;
}

th {
  background-color: #ddd;
}